option-t/esm/undefinable/or.js

A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.

/**
 *  Return _a_ if _a_ is not `undefined`.
 *  Otherwise, return _b_.
 */
export function orForUndefinable(a, b) {
    if (a !== undefined) {
        return a;
    }
    return b;
}